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      <h1 class="post-title">Make your own Emacs package</h1>

      <div class="post-meta">
        <span class="post-time"> 2017-07-24 </span>
        <div class="post-category">
            <a href="/categories/emacs/"> Emacs </a>
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          <span class="more-meta"> 约 1217 字 </span>
          <span class="more-meta"> 预计阅读 3 分钟 </span>
        
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  <h2 class="post-toc-title">文章目录</h2>
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  <ul>
    <li><a href="#准备">准备</a></li>
    <li><a href="#目录结构">目录结构</a></li>
    <li><a href="#alarm-pkgel">alarm-pkg.el</a></li>
    <li><a href="#alarmel">alarm.el</a></li>
    <li><a href="#打包">打包</a></li>
    <li><a href="#分享到melpa">分享到melpa</a></li>
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    <div class="post-content">
      <p>Make you own Emacs package.
创建自己的Emacs包。</p>
<p>在<a href="https://elpa.gnu.org/">Elpa</a>、<a href="https://melpa.org/">MELPA</a>上面有许多的包，可以做各种各样的事情，但有可能你找不到一个合适你的某个问题的包，这时候可以自己动手写一个package，分离到MEELPA。</p>
<p>其实写一个package是一个比较简单的事情，但是又比较麻烦，麻烦在于有很多的约定需要了解，下面我们来动手写一个简单的闹钟包，参考了<a href="https://www.emacswiki.org/emacs/alarm.el">alarm.el</a>。恰好我的包也叫做<a href="https://github.com/kevindragon/alerm.el">alarm.el</a>，如有疑问请提出。</p>
<!-- raw HTML omitted -->
<h2 id="准备">准备</h2>
<p>开发阶段使用<code>package-insstall-file</code>来安装并且测试包是否正确，这个命令可以安装单个文件<code>something.el</code>，也可以安装一个<code>tar</code>包，这里主要有两个文件，所以需要打成tar包安装。</p>
<h2 id="目录结构">目录结构</h2>
<p>alarm-20170724.1502
|-alarm-pkg.el
|-alarm.el
|-alarm.wav</p>
<ol>
<li>目录名的命名规则是<code>name</code>-<code>version</code></li>
<li>alarm-pkg.el 是给emacs的package提供信息的一个文件</li>
<li>alarm.el 程序主要内容在这个文件</li>
<li>alarm.wav 闹钟响的时候播放这个文件，还可以使用.au文件</li>
</ol>
<h2 id="alarm-pkgel">alarm-pkg.el</h2>
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<pre class="chroma"><code class="language-elisp" data-lang="elisp"><span class="p">(</span><span class="nv">define-package</span>
  <span class="s">&#34;alarm&#34;</span>
  <span class="s">&#34;20170724.1502&#34;</span>
  <span class="s">&#34;A package to alarm yourself at some time.&#34;</span><span class="p">)</span>
</code></pre></td></tr></table>
</div>
</div><p>这个文件比较简单，只是调用了<code>define-package</code>来定义你的包信息，此函数的签名如下:</p>
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<pre class="chroma"><code class="language-elisp" data-lang="elisp"><span class="p">(</span><span class="nb">defun</span> <span class="nv">define-package</span> <span class="p">(</span><span class="nv">_name-string</span> <span class="nv">_version-string</span>
                                    <span class="kp">&amp;optional</span> <span class="nv">_docstring</span> <span class="nv">_requirements</span>
                                    <span class="kp">&amp;rest</span> <span class="nv">_extra-properties</span><span class="p">)</span>
  <span class="p">(</span><span class="ne">error</span> <span class="s">&#34;Don&#39;t call me!&#34;</span><span class="p">))</span>
</code></pre></td></tr></table>
</div>
</div><p>第一个参数是包名，第二个参数是版本号，第三个参数可以是一个长字符串提供说明文档</p>
<h2 id="alarmel">alarm.el</h2>
<p>这个文件的约定比较多，先看一下这个文件的头部</p>
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<pre class="chroma"><code class="language-elisp" data-lang="elisp"><span class="c1">;;; alarm.el --- Alarm</span>

<span class="c1">;; Copyright (C) 2017, Emacs guys, all rights reserved.</span>

<span class="c1">;; Author: Kevim Jiang &lt;wenlin1988@126.com&gt;</span>
<span class="c1">;; Version: 20170724.1502</span>
<span class="c1">;; Keywords: alarm</span>
<span class="c1">;; Maintainer: Kevin Jaing &lt;wenlin1988@126.com&gt;</span>
<span class="c1">;; Created: 2017-07-24 12:00:00</span>

<span class="c1">;;; Commentary:</span>

<span class="c1">;; Set an alarm with `alarm-clock&#39;, and enter the time;</span>
<span class="c1">;; cancel the alarm with `alarm-clock-cancel&#39;</span>

<span class="c1">;;; Code:</span>
</code></pre></td></tr></table>
</div>
</div><p>每一个段落以空白行隔开。第一行是文件名和一个简短的说明，而且开头以<code>;;;</code>三个分号注释。<code>Commentary</code>一段可以是长一些的说明文档，以及使用说明。最后是<code>;;; Code:</code>段，接下面就是真正的代码内容。可以使用<code>checkdoc</code>来检查头部的文档是否正确。还可以使用<code>package-lint</code>包的<code>package-lint-current-buffer</code>命令检查。</p>
<p>最后需要：</p>
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<pre class="chroma"><code class="language-elisp" data-lang="elisp"><span class="p">(</span><span class="nb">provide</span> <span class="ss">&#39;alarm</span><span class="p">)</span>

<span class="c1">;;; alarm.el ends here</span>
</code></pre></td></tr></table>
</div>
</div><p>完整的<code>alarm.el</code>如下：</p>
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<td class="lntd">
<pre class="chroma"><code class="language-elisp" data-lang="elisp"><span class="c1">;;; alarm.el --- Alarm</span>

<span class="c1">;; Copyright (C) 2017, Emacs guys, all rights reserved.</span>

<span class="c1">;; Author: Kevim Jiang &lt;wenlin1988@126.com&gt;</span>
<span class="c1">;; Version: 20170724.1502</span>
<span class="c1">;; Keywords: alarm</span>
<span class="c1">;; Maintainer: Kevin Jaing &lt;wenlin1988@126.com&gt;</span>
<span class="c1">;; Created: 2017-07-24 12:00:00</span>

<span class="c1">;;; Commentary:</span>

<span class="c1">;; require alarm in you init.el: `(require &#39;alarm)&#39;</span>
<span class="c1">;; Set an alarm with `alarm-clock&#39;, and enter the time;</span>
<span class="c1">;; cancel the alarm with `alarm-clock-cancel&#39;</span>

<span class="c1">;;; Code:</span>

<span class="p">(</span><span class="nb">defvar</span> <span class="nv">alarm-version</span> <span class="s">&#34;20170724.1502&#34;</span><span class="p">)</span>

<span class="p">(</span><span class="nb">defvar</span> <span class="nv">alarm-clock-timer</span> <span class="no">nil</span>
  <span class="s">&#34;Keep timer so that the user can cancel the alerm.&#34;</span><span class="p">)</span>

<span class="p">(</span><span class="nb">defun</span> <span class="nv">alarm-ding3</span> <span class="p">()</span>
  <span class="s">&#34;Play 3 times ding.&#34;</span>
  <span class="p">(</span><span class="nb">dotimes</span> <span class="p">(</span><span class="nv">n</span> <span class="mi">3</span><span class="p">)</span>
    <span class="p">(</span><span class="nv">play-sound-file</span>
     <span class="p">(</span><span class="nf">concat</span> <span class="nv">package-user-dir</span>
             <span class="s">&#34;/alarm-&#34;</span> <span class="nv">alarm-version</span>
             <span class="s">&#34;/alarm.wav&#34;</span><span class="p">))))</span>

<span class="c1">;;;###autoload</span>
<span class="p">(</span><span class="nb">defun</span> <span class="nv">alarm-clock-cancel</span> <span class="p">()</span>
  <span class="s">&#34;Cancel the alarm clock.&#34;</span>
  <span class="p">(</span><span class="nb">interactive</span><span class="p">)</span>
  <span class="p">(</span><span class="nv">cancel-timer</span> <span class="nv">alarm-clock-timer</span><span class="p">))</span>

<span class="c1">;;;###autoload</span>
<span class="p">(</span><span class="nb">defun</span> <span class="nv">alarm-clock</span> <span class="p">()</span>
  <span class="s">&#34;Set an alarm.
</span><span class="s">The time format is the same accepted by </span><span class="ss">`run-at-time&#39;</span><span class="s">.
</span><span class="s">For example 12:00am.&#34;</span>
  <span class="p">(</span><span class="nb">interactive</span><span class="p">)</span>
  <span class="p">(</span><span class="nb">let</span> <span class="p">((</span><span class="nv">time</span> <span class="p">(</span><span class="nf">read-string</span> <span class="s">&#34;Time(example, 12:00am): &#34;</span><span class="p">)))</span>
    <span class="p">(</span><span class="nb">setq</span> <span class="nv">alarm-clock-timer</span> <span class="p">(</span><span class="nv">run-at-time</span> <span class="nv">time</span> <span class="no">nil</span> <span class="ss">&#39;alarm-ding3</span><span class="p">))))</span>

<span class="p">(</span><span class="nb">provide</span> <span class="ss">&#39;alarm</span><span class="p">)</span>

<span class="c1">;;; alarm.el ends here</span>
</code></pre></td></tr></table>
</div>
</div><h2 id="打包">打包</h2>
<p><code>tar -cvf alarm-20170724.1502.tar alarm-20170724.1502</code></p>
<p>然后使用<code>package-install-file</code>安装此tar包，重启emacs后可以使用<code>alarm-clock</code>来设置一个闹钟。记得在<code>init.el</code>文件使用<code>(require 'alarm)</code>，小伙伴快来试试吧！</p>
<h2 id="分享到melpa">分享到melpa</h2>
<p>首先得在github上clone melpa仓库，然后添加一个以包名命令的文件到<code>recipes</code>目录下，这里的文件是<code>alarm</code>：</p>
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<pre class="chroma"><code class="language-elisp" data-lang="elisp"><span class="p">(</span><span class="nv">alarm</span>
 <span class="nb">:repo</span> <span class="s">&#34;kevindragon/alerm.el&#34;</span>
 <span class="nb">:fetcher</span> <span class="nv">github</span><span class="p">)</span>
</code></pre></td></tr></table>
</div>
</div><p>提交，然后提pull request，等待接收。</p>
<p>希望我的<a href="https://github.com/melpa/melpa/pull/4877">提交</a>可以顺利通过。</p>

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    <span class="item-content">Kevin Jiang</span>
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    <span class="item-title">上次更新</span>
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        2017-07-24
        
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